CLASSIFICATION OF THE RHYNCHOPHOROUS COLEOPTERA. 465 
B. IE horizontal; smaller 
næ geniculate, cl abbed : 
Terminal edge of last ventral acute, harsh ite. the last dorsal; 
tibie generally ae and s YTID 
b. Antenne strai 
Ventral segments vane unequal, antenne with annulated club. 
IONIDÆ. 
Ventral segments nearly equal; antennæ with 11 separate joints. 
BELIDÆ. 
CALANDRIDÆ. 
Elytra with the usual fold on the inner face near the side very 
strongly developed ; diverging behind, and becoming gradually 
effaced. 
Ventral segments 3d and 4th shorter, 1st and 2d connate; lat- 
eral prolongations broad, imbricated ; the sharp edge for reception 
in the elytral groove only developed on the 1st and 2d segments. 
Dorsal segments coriaceous, pygidium large, tri om net rounded 
at tip, declivous, alike in both sexes, thou ugh smaller in the thi 
sub-family ; last spiracle covered by prolongation of ati seg- 
ments. 
An excellent synopsis of the United Say species of this 
family has been published by Dr. G. H. H 
According to differences in the form of on mouth, the indig- 
enous genera may be divided as follows: 
A. Pygidium exposed: 
Gular peduncle long, . . oo ee + 6 + COALINDIA: 
B. Pygidium covered by elyt 
Gular peduncle broad, ‘aah concealed, .. + RHINID A. 
Gular peduncle moderate, mouth normal, . . . . COSSONIDE. 
The mouth in this sub-family is formed upon a peculiar type not 
Seen in the genuine Curculionide ; the gular peduncle is extremely 
long and narrow, leaving the maxille visible in the buccal fissures ; 
the mentum is small, sometimes concave, and the palpi not usually 
visible. The mandibles are convex on their outer face and 
Strongly toothed at tip as in many Curculionide. The beak is 
long, curved and cylindrical, the antennez inserted at a distance 
from the mouth, geniculate, with a large club which is-corneous 
and smooth at base, spongy and pubescent over the rest of the 
- Surface. The eyes are transverse and finely granulated. The 
2 *Proc. Am. Phil. Society, 1873. 
AMER. NATURALIST, VOL. VIII. 30 
+ 
